Looking for updated gcode editing instructions to resume a print after interruption
 

Looking for updated gcode editing instructions to resume a print after interruption  

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karbonbasedlife
(@karbonbasedlife)
Active Member

I had a print interrupted due to the dreaded MINTEMP BED error 3/4 of the way through a half-spool print. I want to see whether I can get it to limp to completion (and check out the thermistor cable afterward) by editing the gcode to resume at the next layer, but my searches are turning up posts from 2017 and the gcode seems to have changed since then as it doesn't quite line up.

Can anyone provide insight into how to edit the code to pick back up as though nothing happened? I REALLY don't want to scrap a $10/12 hour print.

Posted : 10/11/2020 2:36 am
karbonbasedlife
(@karbonbasedlife)
Active Member

After thinking to click on the 'resume print' tag, I saw another post where it was suggested to simply start 2nd, modified print from the next layer and glue that to the top of the last print. Is that still the best option to recover an interrupted print or has the process refined to the point that resuming the print is practical?

EDIT: I should add to my original post that I performed the required restart, then immediately returned the bed to the print temperature to keep the print from separating.

This post was modified 4 months ago 2 times by karbonbasedlife
Posted : 10/11/2020 2:43 am
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(@-2)
Illustrious Member

If by chance the print was a power fail - and not the lightening sort of power fail where power flickers for a bit then dies - and you are there and then power comes back before the bed is cold along with the rest of the house - a power fail recovery has a 50-50 chance of working. And I am an optimist.

When a print fails mid-way ... plan on starting over. 

Yes, if you can count which layer it failed on - have a sanding platform large enough to sand the full part in a plane - or you don't care 1/2 the part is at 12.3 mm and the other half is at 12.45 mm with a gap around the part or whatever the layer height was - you can cut the part in Slicer and reprint the upper portion -- then glue the halves together. 

The problem is knowing exactly where the printer stopped. Gcode is not exactly linear. There are commands that affect things many lines later.  So knowing where to back up to to restart printing is a complex and possibly impossibly problem.  

While tossing $10 of plastic is painful, sometimes it is the optimal solution and better than wasting another $10 print the other half and having a less desirable result.

It is always wise to get more than one opinion... as for trusting Prusa? No way man....
Posted : 10/11/2020 5:59 am
karbonbasedlife
(@karbonbasedlife)
Active Member

Unfortunately, it wasn't a power fail, it seems very likely that I may have a break in the thermistor wire - odd because I have only about 6 days of print time on my machine. That cancels the print in an irresumable manner, so power panic won't help.

Luckily, I was able to tell which layer was last completed or nearly completed. I found the cut function in Prusa Slicer, so I can cut my object (enclosure file 7 for the Lack enclosure) and print everything from that layer, up. I've got some sandpaper and some plastic cement, I think I can get it together.

Gonna have to look into a new thermistor wire, first, unfortunately. I can trigger the MINTEMP BED error simply by sliding the heatbed from one end of the Y axis to the other.

Posted : 10/11/2020 5:09 pm
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(@-2)
Illustrious Member

@karbonbasedlife

Check the power connections - the nuts can come loose and cause odd things, too. Also good time to check the thermistor wire at the housing, you may have crimped and cut it there. It can be repaired - solder the break and recover with heat shrink.

It is always wise to get more than one opinion... as for trusting Prusa? No way man....
Posted : 10/11/2020 8:04 pm
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